+ mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch added to mm-new branch

+ mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/vaddr: add vaddr versions of migrate_{hot,cold}
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
   b) Prefer to cc a suitable mailing list as well
   c) Ideally: find the original patch on the mailing list and do a
      reply-to-all to that, adding suitable additional cc's

*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Bijan Tabatabai <bijantabatab@micron.com>
Subject: mm/damon/vaddr: add vaddr versions of migrate_{hot,cold}
Date: Tue, 8 Jul 2025 19:59:39 -0500

migrate_{hot,cold} are paddr schemes that are used to migrate hot/cold
data to a specified node.  However, these schemes are only available when
doing physical address monitoring.  This patch adds an implementation for
them virtual address monitoring as well.

Link: https://lkml.kernel.org/r/20250709005952.17776-10-bijan311@gmail.com
Co-developed-by: Ravi Shankar Jonnalagadda <ravis.opensrc@micron.com>
Signed-off-by: Ravi Shankar Jonnalagadda <ravis.opensrc@micron.com>
Signed-off-by: Bijan Tabatabai <bijantabatab@micron.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/vaddr.c |   98 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)

--- a/mm/damon/vaddr.c~mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold
+++ a/mm/damon/vaddr.c
@@ -15,6 +15,7 @@
 #include <linux/pagewalk.h>
 #include <linux/sched/mm.h>
 
+#include "../internal.h"
 #include "ops-common.h"
 
 #ifdef CONFIG_DAMON_VADDR_KUNIT_TEST
@@ -610,6 +611,68 @@ static unsigned int damon_va_check_acces
 	return max_nr_accesses;
 }
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+static int damos_va_migrate_pmd_entry(pmd_t *pmd, unsigned long addr,
+		unsigned long next, struct mm_walk *walk)
+{
+	struct list_head *migration_list = walk->private;
+	struct folio *folio;
+	spinlock_t *ptl;
+	pmd_t pmde;
+
+	ptl = pmd_lock(walk->mm, pmd);
+	pmde = pmdp_get(pmd);
+
+	if (!pmd_present(pmde) || !pmd_trans_huge(pmde))
+		goto unlock;
+
+	/* Tell page walk code to not split the PMD */
+	walk->action = ACTION_CONTINUE;
+
+	folio = damon_get_folio(pmd_pfn(pmde));
+	if (!folio)
+		goto unlock;
+
+	if (!folio_isolate_lru(folio))
+		goto put_folio;
+
+	list_add(&folio->lru, migration_list);
+
+put_folio:
+	folio_put(folio);
+unlock:
+	spin_unlock(ptl);
+	return 0;
+}
+#else
+#define damos_va_migrate_pmd_entry NULL
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+static int damos_va_migrate_pte_entry(pte_t *pte, unsigned long addr,
+		unsigned long next, struct mm_walk *walk)
+{
+	struct list_head *migration_list = walk->private;
+	struct folio *folio;
+	pte_t ptent;
+
+	ptent = ptep_get(pte);
+	if (pte_none(ptent) || !pte_present(ptent))
+		return 0;
+
+	folio = damon_get_folio(pte_pfn(ptent));
+	if (!folio)
+		return 0;
+
+	if (!folio_isolate_lru(folio))
+		goto out;
+
+	list_add(&folio->lru, migration_list);
+
+out:
+	folio_put(folio);
+	return 0;
+}
+
 /*
  * Functions for the target validity check and cleanup
  */
@@ -653,6 +716,34 @@ static unsigned long damos_madvise(struc
 }
 #endif	/* CONFIG_ADVISE_SYSCALLS */
 
+static unsigned long damos_va_migrate(struct damon_target *target,
+		struct damon_region *r, struct damos *s,
+		unsigned long *sz_filter_passed)
+{
+	LIST_HEAD(folio_list);
+	struct mm_struct *mm;
+	unsigned long applied = 0;
+	struct mm_walk_ops walk_ops = {
+		.pmd_entry = damos_va_migrate_pmd_entry,
+		.pte_entry = damos_va_migrate_pte_entry,
+		.walk_lock = PGWALK_RDLOCK,
+	};
+
+	mm = damon_get_mm(target);
+	if (!mm)
+		return 0;
+
+	mmap_read_lock(mm);
+	walk_page_range(mm, r->ar.start, r->ar.end, &walk_ops, &folio_list);
+	mmap_read_unlock(mm);
+	mmput(mm);
+
+	applied = damon_migrate_pages(&folio_list, s->target_nid);
+	cond_resched();
+
+	return applied * PAGE_SIZE;
+}
+
 static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
 		struct damon_target *t, struct damon_region *r,
 		struct damos *scheme, unsigned long *sz_filter_passed)
@@ -675,6 +766,9 @@ static unsigned long damon_va_apply_sche
 	case DAMOS_NOHUGEPAGE:
 		madv_action = MADV_NOHUGEPAGE;
 		break;
+	case DAMOS_MIGRATE_HOT:
+	case DAMOS_MIGRATE_COLD:
+		return damos_va_migrate(t, r, scheme, sz_filter_passed);
 	case DAMOS_STAT:
 		return 0;
 	default:
@@ -695,6 +789,10 @@ static int damon_va_scheme_score(struct
 	switch (scheme->action) {
 	case DAMOS_PAGEOUT:
 		return damon_cold_score(context, r, scheme);
+	case DAMOS_MIGRATE_HOT:
+		return damon_hot_score(context, r, scheme);
+	case DAMOS_MIGRATE_COLD:
+		return damon_cold_score(context, r, scheme);
 	default:
 		break;
 	}
_

Patches currently in -mm which might be from bijantabatab@micron.com are

mm-damon-core-commit-damos-target_nid.patch
mm-damon-core-commit-damos-migrate_dests.patch
mm-damon-move-migration-helpers-from-paddr-to-ops-common.patch
mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch
docs-mm-damon-design-document-vaddr-support-for-migrate_hotcold.patch
mm-damon-vaddr-use-damos-migrate_dests-in-migrate_hotcold.patch
mm-damon-move-folio-filtering-from-paddr-to-ops-common.patch
mm-damon-vaddr-apply-filters-in-migrate_hot-cold.patch